--- Have you solved your problem?---I've kept on thinking about that matter ______, but I have no idea yet now.
—Is that your father?—No. It’s my uncle, my mother’s _____.
We have four classes ______ the morning.
下列每组字母中不含元音字母的是 组。
下列字母中含有相同音素的是 。
一How are you ? 一________________.